68% (1989)

68% (2007)

76% (1989)

73% (2002)

70% (1990)

73% (1987)

64% (2008)

71% (1988)

100% (1996)

71% (1992)

66% (2005)

65% (1983)

70% (1993)

52% (2003)

60% (1990)

67% (2006)

76% (1999)

63% (1996)

60% (1994)

57% (2004)